I have googled around and found all the usual solutions. None of them work for me. First of all, I want to make high quality recordings. Second, I use JACK audio (PulseAudio is completely uninstalled.)

My OS and hardware details are at the end. But I think JACK audio is the main challenge when it comes to screencasting. JACK is my only option because this computer's purpose is audio production.

My next challenge seems to be Ubuntu itself... ffmpeg and Ubuntu aren't so friendly. I don't really feel like compiling my own ffmpeg, for example. And even if I do (which is an option of last resort), I want to be able to record specific program windows easily, even if they move around on the screen. Command line ffmpeg seems to be limited to recording predefined screen regions and it lacks flexibility, easy of use, and simplicity.

I seek a GUI approach to recording my desktop with audio using JACK. And I want high quality audio and video that are sync'd. I think a significant number of Linux users are interested in a solution like this.

The developer of SimpleScreenRecorder (SSR) said he intends to add JACK support, so SSR is at the top of my list of potential solutions.

SimpleScreenRecorder is a Linux program that I've created to record programs and games. There were already a few programs that could do this, but I wasn't 100% happy with any of them, so I created my own.

My original goal was to create a program that was just really simple to use, but as I was writing it I started adding more and more features, and the result is actually a pretty powerful program. It's 'simple' in the sense that it's easier to use than ffmpeg/avconv or VLC, because it has a straightforward user interface.

Features

Graphical user interface (Qt-based).

Faster than VLC and ffmpeg/avconv.

Records the entire screen or part of it, or records OpenGL applications directly (similar to Fraps on Windows).

Synchronizes audio and video properly (a common issue with VLC and ffmpeg/avconv).

Reduces the video frame rate if your computer is too slow (rather than using up all your RAM like VLC does).

Fully multithreaded: small delays in any of the components will never block the other components, resulting is smoother video and better performance on computers with multiple processors.

Pause and resume recording at any time (either by clicking a button or by pressing a hotkey).

The reason I decided not to use Kazam is the lack of recent development. See the blog post here: twm-kd.com/linux/kazam/the-future-of-kazam-screencaster . Back in August he admits that "Work on Kazam came to a grinding halt." He also says the future looks bright. But the current features of SimpleScreenRecorder (and the possibility it will have JACK audio support in the future) together with the lack of recent activity on Kazam made my decision.
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MountainXSep 19 '13 at 18:46